diff options
Diffstat (limited to 'src/cpu/qemu-x86/cache_as_ram_bootblock.S')
| -rw-r--r-- | src/cpu/qemu-x86/cache_as_ram_bootblock.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/cpu/qemu-x86/cache_as_ram_bootblock.S b/src/cpu/qemu-x86/cache_as_ram_bootblock.S new file mode 100644 index 0000000000..8e78aaaf96 --- /dev/null +++ b/src/cpu/qemu-x86/cache_as_ram_bootblock.S @@ -0,0 +1,63 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com> + * Copyright (C) 2007-2008 coresystems GmbH + * Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <cpu/x86/cache.h> +#include <cpu/x86/post_code.h> + +.global bootblock_pre_c_entry +bootblock_pre_c_entry: + +cache_as_ram: + post_code(0x20) + /* + * Nothing to do here on qemu, RAM works just fine without any + * initialization. + */ + + post_code(0x21) + + movl $_car_stack_end, %esp + /* Align the stack and keep aligned for call to bootblock_c_entry() */ + and $0xfffffff0, %esp + sub $12, %esp + + /* Clear the cache memory region. This will also clear CAR GLOBAL */ + movl $_car_region_start, %esi + movl %esi, %edi + movl $_car_region_end, %ecx + sub $_car_region_start, %ecx + shr $2, %ecx + xorl %eax, %eax + rep stosl + + /* Restore the BIST result and timestamps. */ + movd %mm0, %ebx + movd %mm1, %eax + movd %mm2, %edx + + pushl %ebx + pushl %edx + pushl %eax + +before_c_entry: + post_code(0x29) + call bootblock_c_entry_bist + /* Never returns */ +.Lhlt: + post_code(POST_DEAD_CODE) + hlt + jmp .Lhlt |